At what point of human or hominid evolutionary history did short-term (monthly) ovulation cycles become the reproductive norm? |
- At what point of human or hominid evolutionary history did short-term (monthly) ovulation cycles become the reproductive norm?
- How is fresh water created on remote islands surrounded by the salty ocean water? In other words how did ancient societies get enough drinking water in Oceania? Do the islands just have to be big enough?
- Are fallen leaves traceable to their specific tree of origin using DNA analysis, similar to how a strand of hair is traceable to a specific person?
- How did they find out light and radioactivity and radio were all the same electromagnetic phenomenon?
- Is there a noticeable difference in the eye muscles between cultures that read left to right and cultures that read right to left?
- Which was the most watery 'Age' the Earth has gone through?
- Since Adderall is a stimulant, why is it used in the treatment of ADHD? Is it not counterproductive?
- Whats the difference between the ISO and HCI method when used to analyse the contents of cigarette and cigar smoke during puff tests?
- After all the decay is done, why don't teeth just fall out of a human skull?
- What exactly is fractional distillation?
- Can we perceive musical harmonicity under the audible range (infrasonics)?
- What are Voyagers 1 and 2 orbiting?
- How much taller would the Appalachian Mountains have to be to have permanent snowcaps?
- Why can chimerism exist, while donor organs seem to get rejected?
- Why does sodium move inside the membrane during an action potential?
- Are viruses made up of organic molecules and water?
- How does spin work in particles other than electrons?
- If a person born with the Thalidomide birth defects, will those be passed on to offspring?
- Why are there multiple oceans and not just one ocean?
- How did people do selective breeding to plants thousands of years ago?
- Why doesn't the stomach digest itself?
- What causes brain freeze when eating something cold too fast? and why isn't there a reaction in our brain when eating something hot, too fast?
| Posted: 14 Feb 2020 06:46 PM PST I've done some brief reading on the topic, and it appears that bats and great apes (and humans) are the main branches of mammal species that have short-term ovulation cycles rather than just a few fertile seasons per year. In our evolutionary history, at what point did this become common? As a follow up question, do we have any evidence of a rapid population growth due to increased year-round fertility of a hominid or precursor species? [link] [comments]  |
| Posted: 14 Feb 2020 05:36 PM PST I was just watching a video about the Mahjapahit(?) and they mentioned how a certain island was important for its drinking water. What does that mean? What process occurs to let some islands have fresh water? [link] [comments]  |
| Posted: 15 Feb 2020 06:59 AM PST |
| Posted: 14 Feb 2020 02:31 PM PST |
| Posted: 15 Feb 2020 04:21 AM PST |
| Which was the most watery 'Age' the Earth has gone through? Posted: 15 Feb 2020 04:00 AM PST |
| Since Adderall is a stimulant, why is it used in the treatment of ADHD? Is it not counterproductive? Posted: 15 Feb 2020 01:43 AM PST |
| Posted: 15 Feb 2020 05:13 AM PST I'm writing a paper on cigars and i found this study on PubMed, but i don't know what the methods used to analyse the smoke are... The first link is the picture of the graphs where they compared different ingredients in a cigarette and 2 different brands of cigars using the 2 methods. The links of the graphs and the article are below. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6093475/figure/F3/ [link] [comments]  |
| After all the decay is done, why don't teeth just fall out of a human skull? Posted: 15 Feb 2020 06:56 AM PST |
| What exactly is fractional distillation? Posted: 15 Feb 2020 05:20 AM PST Could someone please explain fractional distillation? I find it really confusing to understand. Thanks! [link] [comments]  |
| Can we perceive musical harmonicity under the audible range (infrasonics)? Posted: 14 Feb 2020 02:34 PM PST Acoustics student here. Our ears can properly hear frequencies down to 20 Hz, under that frequency we can feel infrasonic pressure waves through the body. is it possible to perceive intervals or harmony between an audible and an infrasonic tone? can our brain recognize an harmonic relation between a note perceived by the ear and a pulsation perceived through the body? [link] [comments]  |
| What are Voyagers 1 and 2 orbiting? Posted: 15 Feb 2020 03:39 AM PST I was wondering whether or not they are simply orbiting the galactic centre by now. [link] [comments]  |
| How much taller would the Appalachian Mountains have to be to have permanent snowcaps? Posted: 14 Feb 2020 07:45 PM PST I have spent a lot of time in and around the Appalachians of Virginia and West Virginia, and I've noticed alpine forests in their upper regions. (By contrast, the surrounding woods are generally warm, humid, and filled with broad-leafed trees). If the mountains "kept going" upwards, where would the trees start to peter out? Where would year-round snow accumulate? I understand that this could vary greatly by location, so I am willing to narrow things down to specific peaks: Mount Washington) in the north (which admittedly already has a treeline), Spruce Knob in the middle, and Mount Mitchell in the south. [link] [comments]  |
| Why can chimerism exist, while donor organs seem to get rejected? Posted: 14 Feb 2020 09:12 AM PST |
| Why does sodium move inside the membrane during an action potential? Posted: 14 Feb 2020 03:09 PM PST I get that at resting potential, the inside of the membrane is less positive than the outside. Nevertheless, wouldn't potassium cation ion still make the inside of the membrane overall positive? If both the inside and outside of the membrane are overall positively charged, then during depolarization, what is driving Na+ into moving towards yet another positively charged region? Likewise, what force is causing K+ to move to the outside of the membrane (which is also positively charged)? Can someone please explain to me the underlying biophysics? [link] [comments]  |
| Are viruses made up of organic molecules and water? Posted: 14 Feb 2020 01:22 PM PST I'm interested in definitions of life and one in particular demands that lifeforms are made up of organic molecules and water. I know that viruses have a protein shell called a capsid, which is composed of organic molecules, but are they composed of water in any way? [link] [comments]  |
| How does spin work in particles other than electrons? Posted: 14 Feb 2020 07:03 AM PST I have watched a dozen or so videos and read several blogs on spin, and the most comprehensive explanation seems to be that spin is a type of "magnetism." All these videos and blogs use electrons to describe the property because it is "easiest to understand." Sure. Magnetism makes sense with electrons and we can all keep it within the electromagnetic spectrum. However, this "easy explanation" also means I have no idea how to translate this idea to other particles, let alone those that don't interact directly with the electromagnetic field, like gluons. I assume that spin doesn't mean that gluons interact with a magnetic field, but if so, what on earth does it mean? Additionally, the constant use of electrons means all these sources talk about half integer spins. I get the difference with the pauli exclusion principle. I don't get how this "magnetism" translates to integer spins. Is it virtually the same or is there a difference in behavior (other than being subject or not to the pauli exclusion principle)? P.S. I am an English major who has recently plunged into channels like PBS Spacetime and the Science Asylum. I have some context but too much math and too much jargon make my head spin (not sure if half integer or integer though). [link] [comments]  |
| If a person born with the Thalidomide birth defects, will those be passed on to offspring? Posted: 14 Feb 2020 12:45 PM PST Mothers in the 50's and 60's taking this drug, for sleeping pills, etc. had birth defects: https://en.wikipedia.org/wiki/Thalidomide#Birth_defect_crisis I'm wondering if those children from that result were to have their own kids, would any of the affects from that drug have any affects on their future offspring? Insignificant or not, are any of the implications from these defects passed on in any shape or form through DNA? or are the effects from that drug "reset" when they have children? Just wondering if there is damage in your genetics and it's now apart of your DNA / biology and inheriting in any way? Thanks in advance! [link] [comments]  |
| Why are there multiple oceans and not just one ocean? Posted: 14 Feb 2020 02:32 PM PST Like the Atlantic Ocean is different from the Pacific Ocean, but there isn't really a difference because it's all just one big puddle of saltwater. Is there an ecological difference in species, or water temp, or tectonic plates or something? [link] [comments]  |
| How did people do selective breeding to plants thousands of years ago? Posted: 14 Feb 2020 11:41 AM PST What is the science behind selective breeding and how did humans had this knowledge before modern technologies? It seems a lot of work to grow corn and watermelon a few times bigger. [link] [comments]  |
| Why doesn't the stomach digest itself? Posted: 14 Feb 2020 01:21 PM PST |
| Posted: 14 Feb 2020 08:03 AM PST |
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